The Zombie Destroyer

Kane falls into insanity from craving purpose in his life. He becomes a violent schizophrenic and loses everything, but he can't decipher whether what happens is reality or not. He has no one and lives on the streets until his violent tendencies affect the public. He gets sentenced to life in prison and the decision to whether he gets transferred to a psych ward is interrupted by the apocalypse. A zombie virus spreads through the globe quickly and the remaining humans alive get desperate. Morals and ethics become non-existent, and high security prisons become testing labs for the remaining scientists looking to test their antidotes. It wasn't easy to find rats anymore, so human scum was the next best thing. Soon the prison gets raided by zombies, but not before Kane gets injected with the one and only dose of the antidote. But he comes to find that it isn't just an antidote.